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Forum Index : Microcontroller and PC projects : Newbie question on storing basic programs on an sd card
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| k2backhoe Regular Member  Joined: 04/12/2021 Location: United StatesPosts: 47 |
Hello, pardon my newbie learning curve. I have mmbasic 5.07.01 running on a pi pico. I have learned enough to run servos and to send light patterns out on a WS2812B string. I am trying to store and retrieve basic programs onto an SD card. I am using a wishiot SD card reader via an spi interface. The user manual (5.01.01) gives differing commands on page 36 (SD card support) and page 132 (SPI communications). I tried both, but I get different errors on each. Could anyone point me to an example of working code (and wiring if possible)? Thanks in advance k2 |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
I suspect that that breakout board won't work on the PicoMite. It's designed for connection to 5v systems like the Arduino, whereas the PicoMite is 3.3v only. What you need is a direct connected breakout board, where the connections on the SDcard socket are simply wired directly to the pins. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| FeK9 Newbie  Joined: 04/12/2021 Location: South AfricaPosts: 16 |
GDay from one Newbie to another... :) I also got my MOSI's and MISO's mixed up. My Pi Pico is on a daughter board from Cytron called 'Maker Pi Pico', it comes with SDCard slot... Perhaps you can post your contents of your option list, mention the SDCard slot module you have. I use a Sandisk 8GB, and it works fine... Bellow is the contents of my Option, I've also been tinkering Audio. > option list OPTION SDCARD GP15 OPTION SYSTEM SPI GP10,GP11,GP12 OPTION Audio GP18,GP19, on PWM channel 1 > files A:/ 46 fox.txt 142 toggle1819.BAS 2058994 TomsDiner8.wav 102 tone.BAS 0 directories, 4 files > |
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| FeK9 Newbie Joined: 04/12/2021 Location: South AfricaPosts: 16 |
I'm with Mixtel90 on this one... It's middle of the night here, didn't see at first you mention wishiot SD card. |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2642 |
A 5V SD adapter on a 3.3V system may work for many SD cards, but not all. It is worth a try. I have used one on an MX170. The LDO regulator reduces the 3.3V to about 3V which is on the border. The level shifters on the data pins don't affect the levels too much. |
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| k2backhoe Regular Member Joined: 04/12/2021 Location: United StatesPosts: 47 |
As in page 36 of the user manual, I am using gp22 for card enable, gp19 for mosi, gp18 for clock, gp16 for miso. For sd card power I use Vbus (pin 40) which should give a full 5V. my program is 'THIRD TEST PROGRAM, CONTROLLING A SD CARD READER Option AUTORUN ON Option colourcode on Option sdcard gp22 Option system spi gp18, gp19, gp16 Open "FOX.TXT" For OUTPUT As #1 Print #1, "THE QUICK BROWN FOX" Print #1, "WITH SIX DOZEN LIQUOR JUGS" Close #1 > option list OPTION AUTORUN ON OPTION COLOURCODE ON OPTION SYSTEM SPI GP18,GP19,GP16 > files Error : SDcard not configured > run [4] Option sdcard gp22 Error : Pin 0 is in use > |
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| FeK9 Newbie Joined: 04/12/2021 Location: South AfricaPosts: 16 |
I see you have options in your program, at mo from my limited (newbie) understanding of MMbasic I'm not sure if options can be put in a program listing? I think options should only be shown in the options list... The one option that sticks out is Option sdcard gp22 it should show in the options listing. At the prompt type in that line, it should cause the Pico to reboot. Then do a options listing, it should look a little like shown below. Also for the moment clear out your program listing of options... On the wishiot SD card module... Both an SD card and the Pi Pico are 3.3 volt devices, and nether are 5 volt tolerant. On the module see a little chip next to the card slot, that probably the level shiftier, it rises or lowers the signal to the SD card. The Pico it self probable saw levels closer to 5 volts, not a good. > option list OPTION AUTORUN ON OPTION COLOURCODE ON OPTION SYSTEM SPI GP18,GP19,GP16 OPTION SDCARD GP22 |
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| k2backhoe Regular Member Joined: 04/12/2021 Location: United StatesPosts: 47 |
OK great. Got it working. I am now writing up a very simple and (hopefully) unambiguous example. I will append it to the end of this thread for other newbies as easily confused as I was. Thanks everyone, k2 |
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| FeK9 Newbie Joined: 04/12/2021 Location: South AfricaPosts: 16 |
+1  I've also found a shortage of small minimal working examples while trolling these forums. I believe the manual is a work in progress while the PicoMite firmware is evolving. On the options thing it seems there are two types, one that occur in program listings (transitory) and others that are more permanent and show in the option's list. A little like 'config.sys' and 'autoexec.bat' from Dos day's... FeK9 :) |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7937 |
You may find the Options a little confusing at first, but generally if one is ticked as Permanent then you have to enter it at the command line. Some will reset the device when changed. Most non-permanent Options can be used in a program, but OPTION LIST and OPTION RESET are immediate commands. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4311 |
I think you mean "trawling", if you'd been "trolling" you would probably have been kicked off TBS by now. When it comes to examples then if you mean general BASIC examples any piece of 80's BASIC can be made to work with little effort, perhaps look here http://www.vintage-basic.net/games.html. If you mean programs that flash LEDs then old threads for the PIC32 'mites on TBS may be your best bet, just say what you are looking for and someone will probably help. Whilst there is some ongoing editorial work in the former and titivating of the latter going on I think what we have now is basically the finished article. Best wishes, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| FeK9 Newbie Joined: 04/12/2021 Location: South AfricaPosts: 16 |
@thwill Look at my post from the OP perspective, he knows I'm talking about PicoMite. |
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| thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4311 |
Now I'm confused  , what made you think I was not?Best wishes, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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